Husqvarna Automower Error 042 — No Loop Signal

What it means

Error 042 means the Automower cannot detect the boundary wire signal.
Check the charging station LED and walk the wire perimeter to find a break.

How to Fix It

Check the charging station LED

A steady green light means the transmitter is sending a loop signal.
A red or flashing light indicates a fault at the station itself.
Check the power supply

Confirm the charging station is receiving mains power.
A tripped breaker or cut extension lead will stop the loop signal entirely.
Walk the boundary wire

Slowly walk the full perimeter of the boundary wire.
Look for cuts, sharp bends, or points where edging equipment may have sliced through.
Check connectors and junction boxes

Inspect all wire connectors, especially where sections were joined.
Corroded or loose connectors are a common cause of signal loss.
Repair the break

Use the waterproof wire connectors supplied by Husqvarna to rejoin any break.
Ensure the connection is firm and weatherproofed.
Test with a multimeter

Disconnect the wire from the station and use a multimeter in continuity mode to confirm both wire ends.
No continuity confirms a break.

Frequently Asked Questions

What causes Error 042 on Husqvarna Automower?

Error 042 is caused by an interrupted boundary wire loop.
Common causes include wire cut by garden tools, animal damage, frost heave, or a corroded connector joint.

The charging station LED is green but I still get Error 042 — why?

The station LED confirms station power, not wire continuity.
The loop may have a break even if the station is working.
Inspect the full wire perimeter.

Can I bypass the boundary wire temporarily?

No — the Automower requires a closed loop signal to operate safely.
You must repair the wire before the mower will resume normal operation.